title: Assembly of cerium(III)-stabilized polyoxotungstate nanoclusters with SeO3(2-)/TeO3(2-) templates: from single polyoxoanions to inorganic hollow spheres in dilute solution.
abstract: A versatile one-pot strategy was employed to synthesize three cerium(III)-stabilized polyoxotungstates nanoclusters by combining cerium linkers and SeO3(2-)/TeO3(2-) heteroanion templates: K32Na16[{(XO3)W10O34}8{Ce8(H2O)20}(WO2)4(W4O12)]·nH2O [X=Se, n=81 (1); X=Te, n=114 (2)] and K12Na22[{(SeO3)W10O34}8{Ce8(H2O)20}(WO2)4{(W4O6)Ce4(H2O)14(SeO3)4(NO3)2}]· 79H2O (3), which are the first lanthanide-containing polyoxotungstates with selenium or tellurium heteroatoms. The three clusters were characterized by single-crystal X-ray structure analysis, IR spectroscopy, thermogravimetric/differential thermal analysis, UV/Vis spectroscopy, ESI-MS, and X-ray photoelectron spectroscopy. Their electrochemical, photoluminescence, and magnetic properties were investigated. Their behavior in solution was studied by transmission electron microscopy, which showed that their single polyoxoanions assemble into intact, uniform-sized, purely inorganic hollow spheres in dilute water/acetone solution.
authors.affiliation: Institute of Functional Materials Chemistry, Key Laboratory of Polyoxometalate Science of Ministry of Education, Department of Chemistry, Northeast Normal University, Changchun 130024, P. R. China.
authors.forename: Wei-Chao
authors.initials: WC
authors.lastname: Chen
authors.forename: Hao-Long
authors.initials: HL
authors.lastname: Li
authors.forename: Xin-Long
authors.initials: XL
authors.lastname: Wang
authors.forename: Kui-Zhan
authors.initials: KZ
authors.lastname: Shao
authors.forename: Zhong-Min
authors.initials: ZM
authors.lastname: Su
authors.forename: En-Bo
authors.initials: EB
authors.lastname: Wang
keywords: cerium; nanostructures; polyoxometalates; self-assembly; template synthesis